If you are not sure you can trust your anti-virus program to know about every single virus out there, especially if you’re running a free one, then I would recommend going to this site to get your file scanned by many anti-virus programs.

I’ve look all over the net and the following seems to be the best backup system out there. You get 2GB free, which should be more than enough for most people with documents to backup. If you need a little more let them email your contacts and get an extra 10GB free, so that’s 12GB FREE in total.